Double facts
12
9
100

6x6=

36

100

12x4

48

100

9x2=

18

200

12x12=

144

200

10x12=

120


200

9x8=

72


300

9x9=

81

300

12x8=

96

300

9x11=

99

400

10x10=

100

400

12x9=

108

400

9x10

90